Which of the Following Statements About the American Railroad Industry

Which of the following statements about the American railroad industry during the 1860-1900 period is accurate?

A) The first transcontinental railroad was built in the South.
B) In the 1880s, there still were not enough railroads built to meet the economic demand.
C) Unlike other industries, the railroad industry experienced little corruption.
D) Most of the country's railroads had already been completed before the Civil War.
E) Former soldiers, ex-slaves, and immigrants formed much of the crews who built the transcontinental rail line.